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    <p>It's taken us some time to get to something approaching a solution in the comments thread, so I'm going to summarise it here:</p> <p>This type of error is caused by not successfully linking to the correct <code>libstdc++.dylib</code>, the standard C++ library. Sometimes, you forget to add it, sometimes XCode gets confused.</p> <p>First of all, make sure you are indeed linking to it in your app target's settings: it must appear in "build phases", "link binary with libraries".</p> <p>If it's there, but still failing to link, check the raw build log for any warnings that XCode might be hiding from you: e.g. about wrong architecture. This means you're linking to the wrong version of the file - e.g. linking against the simulator or OSX version instead of that in the <code>iPhoneOSx.y.sdk</code> directory. In the past, with XCode 3, this was really easy to get wrong, and the only way to fix it was to try every single different <code>libstdc++.dylib</code> that XCode offered until one worked. XCode4 normally only offers one, in addition to the names with version numbers. You should normally pick the dylib without a version number.</p> <p>Make sure all subprojects that may link against <code>libstdc++.dylib</code> use the same version in the same location.</p> <p>Check the "Library Search Paths" and "Framework Search Paths" for any paths that you didn't add yourself. I've had XCode set paths to old SDKs here, which confused the linker.</p> <p>Finally, sometimes it helps to just remove the reference to <code>libstdc++.dylib</code>, clean the project, quit and restart XCode, and re-add the reference.</p>
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    1. COGood complete answer.
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    2. COI rechecked my libs and it turns out libstdc++.dylib is a reference to libstdc++.6.dylib which is a reference to libstdc++.6.0.9.dylib so possibly xcode doesn't know how to resolve 2 levels of indirection.
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    3. COIt should normally be able to handle 2 levels of symlinking. All I can think of is that it's actually looking at a file with the same name in another directory. Linking to libstdc++.6 is a perfectly acceptable solution though, so go with that.
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